THE INFLUENCE OF LAND USE CHANGE ON THE DISCHARGE (A CASE STUDY IN TEMON SUB WATERSHED)
| Main Authors: | , IRFAN MALIK SETIABUDI, , Dr. M. Pramono Hadi, M.Sc. |
|---|---|
| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2012
|
| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/99422/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=54849 |
Daftar Isi:
- Flooding in the downstream areas of Bengawan Solo watershed is occured almost every year. That condition is presumed by environmental damage in the upper part of Bengawan Solo caused by land use change. Land use change in the area is mostly related to economic and population aspects. The main objective of this study is to analyze the effect of land use change on the discharge in Temon sub watershed. This study employs Curve Number method. Pattern of land use and its changing were interpreted from satellite images. The best discharge model employed weighted CN value at AMC Class III and rainfall event 4 hours before started runoff. That model gives the highest r at 0.64, the second least RMSE at 186,616.84, and MAPE is 90.21 %. Generally, the predicted discharge delivered under estimate value than the observed discharge. In 1995 - 2002, forest and garden decreased 795.75 ha (66,71 %) and 204.05 ha (25,99 %), while mix garden and bare land increased 350.32 ha (62.67 %) and 431.72 ha (291.37 %). While in 2002 - 2010, forest increased 487.73 ha (122.82 %), while bare land decreased 364.45 ha (62.85 %). Land use change from 1995 to 2002 results decreasing discharge 42,728,017.40 m3 (36.97 %), while in 2002 to 2010 discharge increase 46,371,917.55 m3 (63.66 %). Discharge fluctuation was mostly influenced by the amount of rainfall rather than practice of land use conversions. In 2002, with an occurence of El Nino phenomenon, rainfall is below its normal condition resulting the less amount of discharge.